Blossoming Bosk

{t}: add {u}, {b}, or {r} to your mana pool.
Activate this ability only if Blossoming Bosk has
a blood counter on it.
At the beginning of your End Step, you may exile target creature card from a graveyard with power
less or equal to the number of blood counters on Blossoming Bosk, if you do you gain 1 life.
Sacrifice a creature: Put a blood counter on Blossoming Bosk.